How to fix grub in Ubuntu?

Conclusion

We’ll go through the actual process of getting your system to boot successfully by restoring the GRUB bootloader in Ubuntu in this guide. Now, we’ll see the required steps to fix grub in Ubuntu –

Step 1: Boot the system using Live CD/USB

First, we need to boot the internal system using Live CD/USB for better performance.

Insert the live Ubuntu CD/USB > Boot the system with it.
Select the Boot device from the system’s BIOS or UEFI menu.

Step 2: Open the system Terminal

Next, we need to open the system terminal for further processing.

Find out the already installed Linux partition > Use lsblk or fdisk command.

#bash
sudo fdisk -l

Look into Linux partition type > Note the required device name.

Step 3: Process the Root Partition system

After that, we need to process or mount the root partition system to follow the proper process.

Replace the sda1 with the name of the required device.

#bash
sudo mount /dev/sda1 /mnt

Step 4: Reinstall the GRUB initialization

The process of reinstalling the GRUB depends on the user’s preferences.

If users are using BIOS, then follow the below-mentioned command:

#bash
sudo grub-install --boot-directory=/mnt/boot /dev/sda1

If users are using UEFI, then follow the below-mentioned command:

#bash
sudo mount /dev/sda1 /mnt/boot/efi sudo grub-install --boot-directory=/mnt/boot --efi-directory=/mnt/boot/efi --removable /dev/sda1

Step 5: Update the GRUB initialization

To add all of your machine’s operating systems to the GRUB menu, follow these steps:

#bash
sudo chroot /mnt update-grub exit

Step 6: Reboot the System

Restart your computer after removing the live CD or USB. You should be able to choose which operating system to boot now that GRUB has displayed the menu.

sudo reboot

Also Read

How to fix the GRUB Bootloader in Ubuntu?

How to Fix Ubuntu Boot Problems?

How to Fix Minimal BASH Like Line Editing is Supported GRUB Error In Linux?